import pygame.font

class Button:

    def __init__(self,ai_game,msg):
        '''初始化按钮的属性'''
        self.screen = ai_game.screen
        self.screen_rect = self.screen.get_rect()

        '''设置按钮的尺寸和其他属性'''
        self.width, self.height = 200,50
        self.button_color = (0,255,0)
        self.text_color =(255,255,255)
        self.font = pygame.font.SysFont(None,48)

        '''创建按钮的rect对象，并使其居中'''
        self.rect = pygame.Rect(0,0,self.width,self.height)
        self.rect.center = self.screen_rect.center

        '''按钮的标签只需要创建一次'''
        self._prep_msg(msg)

    def _prep_msg(self,msg):
        '''将msg渲染为图像，并使其在按钮上居中'''
        self.msg_image = self.font.render(msg,True,self.text_color,self.button_color)
        self.msg_image_rect = self.msg_image.get_rect()
        self.msg_image_rect.center = self.rect.center

    def draw_button(self):
        '''绘制一个用颜色填充的按钮，再绘制文本'''
        self.screen.fill(self.button_color, self.rect)
        self.screen.blit(self.msg_image,self.msg_image_rect)
